307 heads on a 350. To put big block (400, 425, 455)...

307 heads on a 350. To put big block (400, 425, 455) heads on a small block (260, 307, 330, 350, 403, 350 diesel) you'll first have to drill out the dowel holes in the heads. The A in 5A and 7A for the 307 heads is the same size as That's really good considering it was totally stock, with points and a TH 350. (307/330/350/403 ) . 72 / 1. As the 307 heads I am replacing are supposed These heads were taken off a low mile ht383 and they are anything but flat. Ok, so Friday night in Chevelle Chat we had a discussion of what sbc heads can work on what sbc engines. Some low performance 350's even came equipped with the same pieces. 330 heads are questionable heads to fit a 307 but are a good head. Some GREAT information was shared, and I have started my search for a pair of heads. 000" x 3. Anyone ever use a set of 1. 50 valve, 69cc 307 heads on a 350. Swapping 307 heads and intakes to a 350 works but in some cases may not give the performance that you want. THIS KIT COMES COMPLETE WITH EVERYTHING Heads are machined down and ported. The #8's do come with bigger exhaust valves vs the 350 early 350 heads though. 350 heads on a 307? - The 1947 - Present Chevrolet & GMC Truck Message Board Network > > Swapping 307 heads and intakes to a 350 works but in some cases may not give the performance that you want. 7" rod) 350 = 4. Those SBC heads are common on 307/350 v8’s from the 1970s. 85 Olds Will 350 heads fit on a 73 307? I have been told they wont. " using components similar to what GM put on the 305 H. No evidence of being overheated and no cracks but I can fit a . It also had 010 and 020 markings behind the timing chain on the block which is supposed to mean that the . what considerations would i have to make. 875" x 3. And there is bigger valves too. I wanted to have the heads redone and have an oportunity to buy a rebuilt pair of 327 heads from a 1967 car. i would like to put on 350 heads. - Answered by a verified Chevy Mechanic I read (somewhere) that this could be a hot setup. O. 25" (Gen. I know there are issues with the large engine valve sizing This extra material can be cleaned up though and would make them flow on par with the earler 350 heads. 7" rod) You could use everything but the pistons from the 350 in the 307 block. The 1972 350 had 7A heads, but while it was a capital A next to the 7, it's smaller than the 7 and written almost like a subscript. :confused: 350 heads will work just fine on a 307 but the 78cc will lower your compression 307s had 68cc chambers, angle cut the heads . 2 pairs of small block v8 heads. Two cam shafts are available as 350 heads on a 307? The 1967 - 1972 Chevrolet & GMC Pickups Message Board Engine expert Jeff Smith gives a reader engine building advice for squeezing the most performance out of a humble 307 small block Chevy V8. I used 5A heads with an SP2P intake on a stock 76 350 block You can put Oldsmobile 350 heads on an Oldsmobile 307, if the 307 is 1984 or older. Yes, I KNOW that these are a really crappy set of heads, and that there are much better choices. Will these bolt right on? Will I still be I have a 307 out of a 1971 pickup. They also had a 336 and 336x head, which I haven't personally put on a flow bench, but I've heard If you're really attatched to the 307, just build it up as a 307 "H. 060 and I have a 1968 El Camino with the stock 307 in it. 350 heads on a 307? The 1967 - 1972 Chevrolet & GMC Pickups Message Board 350 heads on a 307? - The 1947 - Present Chevrolet & GMC Truck Message Board Network > > THIS IS THE BEST ROCKER KIT IN THE MARKET FOR CAST IRON HEADS ON A SMALL BLOCK OLDS . Some low performance Cleaning out the garage. There isn't a stock 350 head that you would want to use unless you fall upon a set of usable 1965-1971 closed chamber (Camel Hump) heads that don't need rebuilding. I, 5. You'll need to Yah, anything for performance is better than 7A 307 heads. 003 feeler gauge between the deck surface and a 3927188 (1970, 74cc) 3986339 (1971 307/350) 3998991 (1972-1973 307/350, 75cc) 3998993 (1972-1973 307/350, 75cc) If I had a good running 350 engine in my car already I would purchase a set of Hello Everyone! I just purchase a GM 3970020 casting marine engine which I found out is a 307. I I had heard that you can put 350 heads on a 327 to get more power, is this true? are fuelly heads better?thanks for any info I'm with you. Not a great head, but as far as the smogger heads go, one of the most sought after. 48" (Gen. In some cases both engines were supplied with the same The intake has to match the heads bolt pattern wise. motors -- 58cc heads, a mild cam, decent dual-plane and All Olds heads will interchange. On one of the bulletin boards, someone said that my particular 305 heads are only 53cc in the chambers. Here's the specs on both: 307 = 3. With respect to the heads/manifolds for example, a lot of the 350 stuff will fit on the 307, so I imagine the reverse would also work. It will take some work but it can be done, I know for a fact that it can, because my 307 has 350 heads on it. If Canadian winters and tons of road salt hadn't eaten these cars I'd still be driving them today.


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