That is a Saginaw cast intake. Same as FE327CHEVY's.

HI has 3 x uses:

1965 250hp 327 4BBL manual with A/C Corvette.
1968 250hp 327 4BBL manual full size.
1969 250hp 350 2BBL full size.

You'll only find the HI though on the end of the date code on the engine number pad, not in the casting.

1965 250hp is a different engine, it is the base 327 for Corvette in 1965. It won't normally have a code as it is the base V8. It won't be a Quadrajet either, but a Carter or one of those earlier Rochester things.

The HP ratings are SAE Gross so exhaust doesn't come into the equation, but exhaust manifolds do.

The 1968 250hp 327 L48 HI is the same engine we got here in the GTS327. I agree that some US literature shows this engine option as 75cc heads and between 8.5 and 8.75:1 compression, and this is what is in the technical data also. BUT this is the problem, as our 327 and any others from Tonawanda (which will include Canadian stuff as they didn't make 4BBL 327's so would have imported them from Tonawanda) got 69cc heads for about 9.1:1 compression.

The 1967 4BBL 327 was 240hp I think as it had 75cc heads, as that is the only difference I can find between the 1967 4BBL 327 and the 1968 version with 69cc heads(that we got here). Same Quadrajet, same inlet manifold, same cam, same dizzy. Finding data on the 4BBL 240hp 1967 engine is hard though as it was a rare option.

Edit - I just found what the 1965 250hp 327 is. It is 10.5:1 engine, and is PO L30 in full size Chevy. This is the 1965 version of the 1967-1968 L30 which was 275hp - the main difference for 1967-1968 is a slightly smaller but hydraulic cam and slightly less compression (slightly larger combustion chambers for 10:1) and the biggie - a Quadrajet (the 1965 got a Carter) which is where most of the extra peak hp comes from as the Crater is a far smaller carby.

Edited by user Sunday, 8 May 2016 8:16:16 PM(UTC)  | Reason: Not specified

Just keeping this point separate, my heads were made only a few hours apart from the ones shown in the pics from Rystyhq. But the block 352 bit on mine is in a different spot down much lower and mine doesn't have the big slaggy edge preceding the casted engine number. Mine is a February cast block. So does that mean anything if the numbers are lower on mine at the back of the engine. Some other numbers are different in the casting too. My intake is same as rustyhq but has GM3 on it, but that means nothing cos Saginaw made so many. The block has g3 on it instead of his g4 too. Also, for your info, that batch of Corvette intakes that were stockpiled in 66 for use in 1967 Corvettes, were not made again until 8 months later because they did a catch up run in 1 day cos there were more cars made than anticipated so they were done in February. So I would think a block tooling change might take longer. So my block,might have been used cos it's a feb block casting from somewhere else perhaps but machined and finished at mckinnon. What you think. So this is relevant to your cause cos the 1967 year info is a bit murky and some shakeups seemed to be happening, like with Studebakers too. There's now no evidence that my heads are truck heads because I can't find any reference to them used in trucks.

Edited by user Monday, 9 May 2016 6:27:43 PM(UTC)  | Reason: Not specified

K158 casting date on the intake.
She has ribs just like a ADR27A 308 HX Holden intake manifold has inside as well.

The intake on the less depth side looks to me too be a way of giving better direction maybe as the air is being sucked and not to mention them old Chev engines have a crappy firing order, it maybe to help with that maybe, just maybe.

Edited by user Friday, 13 May 2016 11:56:08 AM(UTC)  | Reason: Not specified

Yes please. Mainly interested in engine number pad, where the block, heads and intake were cast.

Heads are actually 3814482. Have the same cast mark as 290 and 185. Intake 3805393.

My engine is basically identical to this but it had Pontiac rocker covers.

Hi. I am interested.