I'm considering buying a set of 58cc heads, but what will that put my compression ratio at in an L98? I'll be using Summit's rebuild kit with new pistons, if that makes a difference.

 

I would say in the 10.0/1 range maybe more depending on the pistons you get. What type of head will you be using, iron or aluminum?

Steve

 

They're aluminum. I may get them milled a little, and the block decked too if I have enough metal to shave off. I don't want the compression ratio over 10.5.

 

Find out what the cc of the pistons are before you cut anything. Thats pretty important at this point.

 

Weren't the vettes with the L98 aluminum 58cc heads at about 9.8:1 compression? If so, that should be where your at.

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1986 CAMARO Z28 ->
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, B&M Ripper shifter, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, all bushings are urethane, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.22@ 106.4MPH 3300lbs less driver and speakers Next mods-> Extreme Energy 268 cam, Holley street dom intake.

1987 TRANS AM ->
73,000 miles, 305TPI, auto, gutted air box.