Backstop

I'm on the verge of ordering this motor. I have a 73 long hood, my concern is that it won't fit under there. It says it usesWeiand Stealth Dual Plane #8150, and i have a Holley Double pumper, anyone know if that will fit?
365 HP, aluminum heads, roller cam, 87 octane


Any other thoughts on the motor or other questions i should be researching?

Sigforty

Did you know that the engine you listed will need a different flywheel or flexplate due to the one piece rear main. This is more of an issue if you have a manual transmission. I would also wonder why you wouldn't pick up an engine with more compression as well. I also noticed the engine has a long water pump. You will need to swap that out or change all your accessories and clutch fan setup to work.

sambrand

I would give Wilcox a call, they typically will either know or spend the time to research a correct answer, especially if the potential sale is an entire engine I cant imagine them not going the extra mile for you.

tomlink

Try this with a low clearance air filter. 430hp/450tq.

jb78L-82

Agree^^^^ Go with a 383 if you are going crate engine and just want some more power.................430 GROSS HP/450 GROSS Tq is impressive....You would have about 300-325 RWHP......as installed in the Car......

Backstop

I can't go over $4000 on this. I hadn't planned on any engine work for a couple of years after i spent my budget on some other stuff this spring, but then the engine blew and here we are. This seems to be the best I can do for the budget if it works out.

Good thoughts about the flywheel and fan, thanks.

ddawson

$170 more dollars.

http://www.high-performance-engines....hp-p/hp94m.htm

For the same price go with the high compression version.
http://www.high-performance-engines....hp-p/hp94m.htm

Call and ask what intake it comes with. Looking at the Summit pictures it's a Weland intake.
https://www.summitracing.com/parts/hpe-hp89m/overview/

scottjamison

My 496 came from Blueprint. It runs great. I had them switch out the manifold for clearance also. I went with an Edelbrock Performer.
Great engine, easy delivery, great support when I had questions.

derekderek

You also can't use the distributor because it doesn't have a tach Drive.

Backstop

Well I screwed this all up LOL. Thanks for saving me a disaster. I think I should stop by the Summit store and talk to them.

george2066

you will get great advice right here

ronarndt

I have a Weiand Stealth on my NOM 454 in my 68 convert with a L-88 style long hood. Even with the extra height of the big block hood, the wing nut on the thin 2 inch thick air cleaner barely misses hitting the hood.

rklessdriver

So the height of the Weiand 8150 is 4.19" front and 5.27" rear.

https://www.holley.com/products/inta...lds/parts/8150

Pretty much identical height wise to the Performer RPM, which many people have fit under the stock 73 and later long hoods with a drop base air cleaner assembly.

You should have no trouble fitting it under you 73's hood with the proper drop base air filter. It's a decent engine but yes the water pump and distributor that come on it are of no use to you in a C3 Corvette... but it's not a big deal, just take them off and replace them with the short water pump and point tach drive distributor off your factory engine.
Willl

cv67

Maybe ATK can make adjustments for those items pretty sure he still posts here.

rklessdriver

It's possible they could make some adjustments for his Corvette.... but swapping a water pump and distributor for the parts he already has is pretty easy.

Call ATK and ask to speak with Brandon Simkiss. He is the manager of the High Performance engine division.

800-421-3746 ( Ext. 309)

At one time he did post on internet forums for the company.... but he hasn't been active on this forum since 2008.

https://www.corvetteforum.com/forums...randonatk.html

Will

NewbVetteGuy

I know it's $170 over your budget, but that ATK HP94M 383 looks AMAZING!

I really like ATK, they are engine builders first and money makers second, IMHO. The HP94M has ATK's variant of the Profiler heads on them; they're top-shelf heads that produce great torque. The owner of ATK has a modified casting that keeps the exhaust ports at standard height, instead of the Profiler heads' normally raised exhaust ports- this slightly hurts the CFM flow numbers on the exhaust side but header fitament with the Profilers is painful and NOT with these ATK heads. ATK also worked to improve the oil drain back of the early Profiler heads and the changes that ATK mandated in their casting was incorporated back into all Profiler heads. -They don't have great name recommendation or marketing / branding, but when you see a primarily crate engine company go so far as to get custom head castings made (of already exceptional heads) and provide feedback that ultimately causes a head casting to get changed, I think you've found someone pretty obsessed and trustworthy.

The HP89M seems to be the 350 equivalent of the 94M for $3,810. -That's a great engine, too with the same ATK modified Profiler 195cc heads and a roller cam; BEAUTIFUL torque curve, BUT those 195cc heads are better matched to the 383's piston speeds @ 6,000 RPM and you can see it in the huge jump in torque: The HP89M has the same heads, same cam, slightly more compression and about a 410 ft lb torque average to 5,500 but the 383 version -same cam, same heads, slightly lower compression JUMPS to 460 ft lbs. That's a 50 ft lbs increase from a 33 cubic inch increase in displacement because average air speed through the ports is faster because of the added distance the stroker crank makes the piston travel. (the 383 is perfectly matched to those Profiler 195cc heads)

The ATK HP94M incudes a SCAT crank vs. an "OE crank" and scat forged i beam rods and ARP rod bolts vs. power medal rods with stock bolts. -IMHO, the upgrade in the rods and bolts and the extra 33 cubic inches and 50 ft lbs is worth the price difference for sure. -I wouldn't trust the stock rods and bolts to get spun much higher into the future with a bigger cam; I WOULD trust the HP94M with the Scat crank, and Scat forged I beam rods and ARP bolts with 6,500 RPM. (I think the hyper pistons beyond that piston speed become the concern.)




Adam

NewbVetteGuy

X2! Call Brandon.

I was 2 days from buying Brandon's Profiler heads for my engine and I got a deal on the raised exhaust port version that I couldn't refuse on Black Friday, instead. If I ever need a crate motor, I'm heading straight to Brandon / ATK.

I'm impressed by his attention to detail / obsession with the product and being willing to talk to people.


Adam

scottjamison

I switched the tach.

sambrand

4k is a lot of cash but unfortunately in todays dollars it doesn't go far, I don't know what level your mechanical skills are or your avail spare time, but it is possible to assemble quite a lot and fit it together on an engine stand, this is assuming your comfortable dealing with ebay sales and multiple vendors, start by looking for a 4bolt main block, cost can easily end up being more that route but if you have to time to shop and the skills to put it all together that's where I would go if the budget is an unmovable barrier to getting back on the road, best of luck, been there done that!

Backstop

OK, the HP94M does look like a good deal. I do have a fairly new distributor on the old motor that I can move over and a new water pump isn't too much more money. I'm not enthused about using the old one with the amount of little metal mbits that may have gone through it.

Actually I can probably buy a water pump with the summit bucks the engine purchase gets me lol.

Thanks for the research on the intake and all the knowledge everyone.