Well seems that I have hurt my 305. Took it to the test and tune last night. Racing a Civic, pushed it to 5,500+, suddenly lost alot of power, and picked up a miss. Will have to post pictures when I strip it down. From the initial appearance, I a have blown a head gasket. No mechanical noise or chunks of metall, but milky looking oil, and lower than normal compression in cylinder 5 and 7.

 

dude, that sucks. hope everything turns out to be ok, other than your head gasket.

 

I look at it this way though, it gives me a chance to put on my newest pair of 193s onto it. It will reduce my compression from 10.3:1 down to about 9.4:1.

 

thats a pretty good drop in compression. do you think you'll lose much power? how ported are those 193s......cuz knowing you they have pretty extensive porting. i definately should have ported mine a lot more. i even had them off over thanksgiving break and i didn't think to do it.

 

Nah, I have had a pair of stock 187 305 TBI heads on it since the begining of January. The Ported 193s will give me alot more power. The drop in compression is needed though. I am having some problems even on 93 octane when the engine is pulling hard. I am thinking that I will be able to get away with 87 octane with the right advance curve.

 

well then bonus that you'll end up w/ more power. can't go wrong with that. still sucks changing out heads in the frame though...........and it especially looks fun doing it in a full size van.

 

The 1994 300 Ford I6 that I did at work took longer than it takes me to swap both heads. Mainly because those fords are BS to work on. I would rather lay over a seat than a fender anyday. Its not as bad as it looks.

 

Good luck Fast and I can't wait to see what else you can do with that van

 

Working indoors can be a real treat during winter or heavy rain.

 

5,500 rpms and thats all it took? (I understand they start losing power around 4) But i've taken mine to 6,000 on accident (tires spinning) with no problem..

 

No, I have taken this engine to 6,500 rpm alot of times and used NO2 too many times to count. This was a NO2 pass. 400 FWHP is alot to ask for a head gasket that is not sitting properly. Guess what the stock 187 head is the restriction that chokes it at about 5,000 rpm, but I still take it out to 5,500. The NO2 is LIKELY the culprit that blew the gasket. Either that or the 187s that I put on in January were warped.

 

The postmortem! I started at 12:00 today and got finished at 3:30. 3.5 hrs=not bad at all for both heads in a van. Well the engine had a blown head gasket between 5 and 7. Number 7 had a burned exhaust valve. Both heads had cracks in them????

As always I am short on time as well as, I am tired of messing with this 305 and any rebuilt engine for that matter. I am going with a GM Goodwrench HD 350 TBI crate engine for medium duty trucks. Thats right a Motorhome/Dumptruck/Schoolbus engine is going into my van. It has a forged crank, forged rods, 4 bolt mains, RV type cam, Swirl Port heads with oversized exhaust valve stems and sodium filled exhaust valves, larger diameter pushrods, 8.7:1 compression ratio, 210 FWHP @ 3,800 and 315 ft/lbs @ 2,800. I am using my Edelbrock 3704 intake, stock sized ultimate TBI moded TBI, low-restriction exhaust, stock air cleaner and intake assembly, K&N filter, eliminated the clutch fan, underdrive crank pulley, and a custom tune on the EBL. It should make around 235-240 FWHP @ 4,500 and 340 ft/lbs @ 2,800. It is rated to pull up to 20,000 lbs GVW on 89 octane gas. It comes with a 3yr/100,000 mile warrenty, all the tin, a harmonic balancer, a $100.00 rebate on the core charge, and the local dealer has one in stock for $1740.00. Don't hold your breath, they have been discontinued and this is one of the leftovers.

12514811 5.7L 350 (HD) medium duty truck 4 bolt main One Piece Seal, Steel Crank is what Sallee chevrolet had to say about them.

 

that should be a good long lasting engine. those sodium exhaust vavles aren't cheap. i put a set in some 429 ford truck heads that i did a valve job on, and they were like i think 60 bucks a piece.

 

That was my thought when I saw the information about it. The warrenty is worth it IMO. Called the dealer yesterday to see if I could still get one and they said sure. There are 5 in the DFW metroplex and my local dealer has one that they are holding for me. I am picking it up tommorrow night after work.

If it can see sustained WOT in a 66 passenger school bus full of kids for 100,000+ miles, I doubt I can hurt it, short of over-reving it. Over-revving it would be kinda hard though as it probably won't have much left at 5,000+ and I can dial in the fuel shut-off at whatever the recomeended max RPM is from chevrolet. Should be around 5,200 rpm or so. I'll probably set up the governor to shift it around 4,800.

 

ya that will be a hell of an engine. good and stock and strong.

 

What happened with this:

https://www.thirdgen.org/techbb2/sho...hreadid=340412

 

There was another thread that he said he sold that motor because someone offered him a good deal more than what he bought it for.

Are your ported 193's going on the next motor or would you be intrested in selling them? *dibs*

 

i accidently put my camaro to 6,000 today. This 4 cylinder s10 blazed by me going about 40 when i was going 15 and i dropped it into first.. and i glanced over at his truck forgetting i put it in 1st . I then happened to glance at my rpms and i said ****! it shifted into second real hard.. I felt bad for my ole' maro Yea.. i felt like a tard.. but i was happy it was ok.

 

when my tranny was going out, i was on the interstate doin about 85, and it double shifted down into 2nd gear, and rapped my stock LO5 to over 6000. i almost pooped. the next day it wouldn't shift out of first. these motors can take crap like no other.