Anyone know where to find GMC's 302ci straight six from the early 70's? Any decent parts available for them? Are the head's intake/exhaust ports different from a 250/292?
GMC's 302ci straight six from the early 70's
No such thing.
The 250 & 292 heads are the same pretty much
MBHD
These engines are actually GMCs 'small block' that came in trucks from 1939 to 1962, they came in 228", 236", 248", 256", 248", and 302". The 302" came out in about 1952 and was used in larger trucks, busses, and military vehicles. The GMC and the Chevy 'Stovebolt' six from 1937 to 1962, in 216", 235", and 261", especially with the Wayne 12 Port Head (or variations) is what the Inliners International was origianally founded on.
There are many , mostly vintage, performance parts still available tho' they tend to be pricey and harder to find than the later model sixes which have a completely different layout. Check your swap meets, eBay, and our 12 Port Advertisers and Classifieds.
The biggest following of the early engines now seems to be the folks who ran them 'back in the day' and the vintage classes at Bonneville and El mirage. They still hold their own, among them are the Fergusons who ran 300mph with a 302" based engine in their streamliner, JD Tone has a record over 200mph in a roadster, Doug Robinson who has many records, and there are several other Inliners who compete annually with these vintage engines at the Salt.
Tim
Thanks for the info, Titen
I have a 1952, 302 (now 321 cid)GMC in a HAGR dragster. We currently hold the HAGR quarter mile record.
I personally wouldn't recommend you build a GMC unless you need to punish yourself for some unspeakable transgression from your youth that involved a goat, 3 rubber snakes and kids wading pool.
Ron