spark plug question
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spark plug question

  1. #1
    Aquacraft Eddie's Avatar
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    Default spark plug question

    hi, i havnt been on here for a while, but to make a long question short, I came across a rebuilt 454, 30 over with 781 heads, the guy told me it had slight domed pistons, I ended up buying the motor for a good price, he had to sell , my question is what plugs do i run? he broke the motor in and then sold it to me, he said to run acdelco r45t plugs, but he wasnt sure off the top of his head, i looked up the plugs and im not sure they are listed for a big block, i found r45ts plugs but they are slightly longer, he told me to get a plug that had around a 1/2 reach, the plugs i have are 3/4 (r45ts) , i know im leaving alot out like what size dome, but im not sure and i havnt been able to get ahold of him, and when i did he just says as long as are about a 1/2 reach, he says the domes are very slight and the compression is around 9.1, so what plugs do you guys run in 781 heads? I will have to check plug/piston clearance to make sure but I just want a ball park,thanks..

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  3. #2
    gn7
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    Quote Originally Posted by Eddie View Post
    hi, i havnt been on here for a while, but to make a long question short, I came across a rebuilt 454, 30 over with 781 heads, the guy told me it had slight domed pistons, I ended up buying the motor for a good price, he had to sell , my question is what plugs do i run? he broke the motor in and then sold it to me, he said to run acdelco r45t plugs, but he wasnt sure off the top of his head, i looked up the plugs and im not sure they are listed for a big block, i found r45ts plugs but they are slightly longer, he told me to get a plug that had around a 1/2 reach, the plugs i have are 3/4 (r45ts) , i know im leaving alot out like what size dome, but im not sure and i havnt been able to get ahold of him, and when i did he just says as long as are about a 1/2 reach, he says the domes are very slight and the compression is around 9.1, so what plugs do you guys run in 781 heads? I will have to check plug/piston clearance to make sure but I just want a ball park,thanks..
    Those heads do not use a 1/2 plug. They use a 3/4 reach gasket type plug. Put the 45T in it.



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  4. #3
    Aquacraft Eddie's Avatar
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    Thanks GN7, I appreciate the help, I didnt want to go into the whole story so i tried to keep it short. The R45TS plugs have a longer reach than the R45T, I will be running a HEI dizzy, (I have a new one that I never used) so im not sure if i need a resistor plug or not? but anyway the R45tS has about a 3/4 reach and the R45 is about 1/2, is there a 45T ? (no resistor) ? sorry but I thought i would ask here because I have had no time to do research and you guys have always been alot of help, thanks.

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