Heads to Handle a 8-71 Blower???
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Heads to Handle a 8-71 Blower???

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    Senior Member Aximal's Avatar
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    Default Heads to Handle a 8-71 Blower???

    Anyone recommend a decently priced set of heads that can handle a 8-71 Blower for a BBC? Im got original 1974 heads and Motor builder says blower will crack them.. I looked a bit into the Darts, but too pricey for me.. Any info helps! ThanksAX

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    gn7
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    Quote Originally Posted by Aximal View Post
    Anyone recommend a decently priced set of heads that can handle a 8-71 Blower for a BBC? Im got original 1974 heads and Motor builder says blower will crack them.. I looked a bit into the Darts, but too pricey for me.. Any info helps! ThanksAX
    have this heads had the decks excessively machined? What heads are they. Ovals? Rectanglular port?

    The strength of the head has NOTHING to do with the size of the blower. Boost does. Are you running this in pump gas?



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    Last edited by gn7; 07-03-2013 at 07:42 PM.

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    Senior Member jms-1's Avatar
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    You just got this thing and your already going to mess with it?

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    Senior Member lupo1904's Avatar
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    Blowers = weight and looking cool
    You got a badass boat, just build a nos motor

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    gn7
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    Quote Originally Posted by lupo1904 View Post
    Blowers = weight and looking cool
    You got a badass boat, just build a nos motor
    Oh. I didn't know this was a drag boat. Then yeah, toss on a bad ass NOS system. I thought this was a river/lake boat.



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    Senior Member Aximal's Avatar
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    Quote Originally Posted by lupo1904 View Post
    Blowers = weight and looking cool
    You got a badass boat, just build a nos motor
    Well...Lets not talk about why im messing with the motor now.....

    Not sure what the heads are now, but now we're talking about dropping the 13.5:1 compression to 12:1 with cam for pump gas, Wide center lobe, and a 3 angle valve job... Im still new to the whole Motor game.. Im a Vintage Harley guy.

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    Senior Member Aximal's Avatar
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    Quote Originally Posted by gn7 View Post
    have this heads had the decks excessively machined? What heads are they. Ovals? Rectanglular port?

    The strength of the head has NOTHING to do with the size of the blower. Boost does. Are you running this in pump gas?
    I think Oval's.. All he said was he took the heads for Honing and was tlaking about the blower set up we wanted to try and dude said NO WAY not with these heads. too light.. Didnt mention about the decks being takin down too much.. Although they did have 3 ghetto Gaskets on them...

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    gn7
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    Quote Originally Posted by Aximal View Post
    I think Oval's.. All he said was he took the heads for Honing and was tlaking about the blower set up we wanted to try and dude said NO WAY not with these heads. too light.. Didnt mention about the decks being takin down too much.. Although they did have 3 ghetto Gaskets on them...
    I'm guessing that somebody machined the shit out of them to raise the compression, in which case he is right. An stock GM iron head would laugh at pump gas boost pressures.

    good luck with 12 to 1 on pump gas, I don't care what cam you use, with any LSA, with any valve job.
    first punk kid with a 10 to 1 motor and the RIGHT cam will clean your clock, take your lunch money, and kick sand in your face and steal your girl frined.



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    Senior Member Aximal's Avatar
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    Quote Originally Posted by gn7 View Post
    I'm guessing that somebody machined the shit out of them to raise the compression, in which case he is right. An stock GM iron head would laugh at pump gas boost pressures.

    good luck with 12 to 1 on pump gas, I don't care what cam you use, with any LSA, with any valve job.
    first punk kid with a 10 to 1 motor and the RIGHT cam will clean your clock, take your lunch money, and kick sand in your face and steal your girl frined.
    HAHAHA.Ok so back to the question.. Which heads do you recommend then? And Cam and compression... You seem to know alot

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    gn7
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    Quote Originally Posted by Aximal View Post
    HAHAHA.Ok so back to the question.. Which heads do you recommend then? And Cam and compression... You seem to know alot
    Any head except ProComp crap will stand up to a blower. Speically if its a pump gas deal. Compression and cam your builder can decide. If he can make a 12 to 1 pump gas engine run decently, he's a better man than I am.



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    Quote Originally Posted by Aximal View Post
    Anyone recommend a decently priced set of heads that can handle a 8-71 Blower for a BBC? Im got original 1974 heads and Motor builder says blower will crack them.. I looked a bit into the Darts, but too pricey for me.. Any info helps! ThanksAX
    Quote Originally Posted by Aximal View Post
    Well...Lets not talk about why im messing with the motor now.....

    Not sure what the heads are now, but now we're talking about dropping the 13.5:1 compression to 12:1 with cam for pump gas, Wide center lobe, and a 3 angle valve job... Im still new to the whole Motor game.. Im a Vintage Harley guy.
    So you are putting an 8-71 blower on a 12-1 motor on pump gas?





    You may get a better answer if you had a more realistic question.

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    Senior Member Aximal's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    So you are putting an 8-71 blower on a 12-1 motor on pump gas?





    You may get a better answer if you had a more realistic question.

    The 12:1 was without the blower. That would be just keeping what I had and dropping compression.

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    gn7
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    If you are thinking about lowering the compression instead of a blower, don't lower it to 12 to 1 and try to make it eun on pump. It will be a dog. Lower to something reasonable like 10.5 MAYBE 11 with "right " cam and some chamber work. It will make way more power than 12 to 1 can on pump.



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    Quote Originally Posted by gn7 View Post
    If you are thinking about lowering the compression instead of a blower, don't lower it to 12 to 1 and try to make it eun on pump. It will be a dog. Lower to something reasonable like 10.5 MAYBE 11 with "right " cam and some chamber work. It will make way more power than 12 to 1 can on pump.
    I am rebuilding a 496 that someone built for a kid,, supposedly 9.6-1, oval port iron heads. 3 destroyed pistons, and the other 5 all had clear signs of detonation. I calculated that it had to be close to 11.9-1.

    He had the compression ratio in writing on the invoice, but the shop is no longer in business.
    Last edited by obnoxious001; 07-04-2013 at 12:56 AM.

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