If they have the stock valves in them then you should have no problem. You will want to doulble check the cylinder diameter and the valve width measurement just in case you get odd heads that may have the bigger valves in them.
Junior Member
Gday,Can anybody tell me if 1970 455 heads are compatible with a 1967 400 block and also do they function from idle to a performance level
without radical engine mods
Thanks Aussie roo
Member
If they have the stock valves in them then you should have no problem. You will want to doulble check the cylinder diameter and the valve width measurement just in case you get odd heads that may have the bigger valves in them.
MY 69 GS 400 1 of 5444
(455 powerplant with stage one heads, carb, distributor, TA 118 cam.)
Dad-70 455 Stage One 1 of 1785
Dads 2nd 69 GS 400 conv 4 speed 1 of 213
Mom- 69 GS 400 conv auto 1 of 1564
Brother- 70 Riv w/ stage one engine
Brother- 70 GS 350 1 of 8840
Lil'st brother 71 gs 455 1 of 1378
just in case you get odd heads that may have the bigger valves in them
by which, Troy means "Stage 1" heads. just so you know that, if you have them, you aren't exactly stuck with a pair of sows ears. they just likely won't be the best performers for you due to the valves being shrouded by the narrow diameter bores of the 400.
time to upgrade to a Tomahawk!( check out page 23 of the catalog )
http://taperformance.com/PAGES%20PDF/2007_D2_WEB.pdf
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H.H. Goddard, Human Efficiency (1920)
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