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#1
10-17-2003, 03:24 PM
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I have a set of #51 heads on a 74 455. I cant find any info on these heads.What year/motor/car did these heads come on?
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#2
10-17-2003, 03:24 PM
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I have a set of #51 heads on a 74 455. I cant find any info on these heads.What year/motor/car did these heads come on?
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#3
10-17-2003, 04:06 PM
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5I's replaced the '73 & '74 4X-1H heads on 455's for '75 model Pontiacs. The 5I's were a large chamber head. Estimates will range from 124cc-128cc chambers. Compression ratio with these heads is low...advertised C/R was 7.6-1, but actually compression ratio was probably less.
A basically long held experience is that all '75 model 455's originally had the 5I's. If anyone has a bone stock original '75 455 that came with heads other than 5I's please contact Rocky Rotella through this board. BTW, welcome to PY board. With your signon name, take it you have a supercharged GTO.
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Buzzards gotta eat... same as worms. |
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#4
10-18-2003, 09:04 AM
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Thanks for the info.Iam in the process of putting together a supercharged pro street 70 GTO.I picked up the car years ago pretty much complete minus motor/trans.Any other info on this project from anybody would be appreciated.
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