383 Questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

palallin · 10-03-2002, 12:10 PM

I'm toying with the idea of building a 383 for my truck. I'm vaguely familiar with the general process of doing so: a 350 with the crank journals turned for a 400 crank.

Question: I have a '69 (larger journal) 327. If memory serves, the bore of a 350 and a 327 are the same. Is it possible to build a 383 on the 327 block? I cannot see a reason it couldn't be done, but I don't know enough to be sure.

Question: If I decide to build on a 350 (thereby eliminating down-time on the truck), is it getting hard to find '69 vintage engines? I've a notion to keep the truck relatively stock (a 383 is just a modified 350, right?), so a '69 engine would be the ideal way to go.

Question: I know that several motor builders used to sell 383 "kits" which included all the necessary parts. Are these still available? From whom?

Question: Does anyone know anything about the 383 crate motor GM is selling now?

TIA.

70c10 · 10-03-2002, 01:12 PM

I know a board member "Tracy Focht" has insight on this. I think it's stroko-motive or something.

low 84 · 10-03-2002, 02:38 PM

speedomotive is the company tracy used

Danny69' · 10-03-2002, 03:20 PM

383 is a 350 block, with a crank from a 400 and it's has the journals machined to a 350..

Forgot to add the obvious bore and strock. So you would need pistons, rods and whatnot.

bigjimzlll · 10-03-2002, 03:26 PM

302-327-350 same blocks..different cranks..you can buy a stroker crank new for 150.00, no need to ruin a good 400 crank

chevy garage · 10-03-2002, 03:55 PM

If you buy an aftermarket crank (SCAT) make sure you check your clearances with oil rails and oil pump. The throws on some of the aftermarkets are larger than the stock 400 cranks. I've seen a SCAT crank used and a spacer had to be made for the oil pump due to clearance reasons. Also, you probably want to balance the rotating assembly.

10-03-2002, 12:10 PM	#1
palallin Registered User Join Date: Jul 2002 Location: St. James, MO Posts: 1,239	383 Questions I'm toying with the idea of building a 383 for my truck. I'm vaguely familiar with the general process of doing so: a 350 with the crank journals turned for a 400 crank. Question: I have a '69 (larger journal) 327. If memory serves, the bore of a 350 and a 327 are the same. Is it possible to build a 383 on the 327 block? I cannot see a reason it couldn't be done, but I don't know enough to be sure. Question: If I decide to build on a 350 (thereby eliminating down-time on the truck), is it getting hard to find '69 vintage engines? I've a notion to keep the truck relatively stock (a 383 is just a modified 350, right?), so a '69 engine would be the ideal way to go. Question: I know that several motor builders used to sell 383 "kits" which included all the necessary parts. Are these still available? From whom? Question: Does anyone know anything about the 383 crate motor GM is selling now? TIA. __________________ '69 Longstep K-10: 327/SM465/T-221/Closed Knuckle Dana44/12-bolt.

10-03-2002, 01:12 PM	#2
70c10 67-72 Addict! Join Date: Feb 2002 Location: The TAX State! Posts: 7,857	I know a board member "Tracy Focht" has insight on this. I think it's stroko-motive or something. __________________ Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads

10-03-2002, 02:38 PM	#3
low 84 Registered User Join Date: Jan 2002 Location: Houston, TX Posts: 2,144	speedomotive is the company tracy used __________________ '51 F100, backhalf with a narrowed 9 and coil overs, 18.5" mickeys, monte front clip, +400" sbc in the works '05 1500 Crew Cab RIP '84 swb 5/7 drop, solid cammed 408 w/ fully ported dart heads, th350 w/ 10 inch hughes, 12 bolt w/ 3.73 richmonds and a locker '80 swb 4x4 in progress: 7" lift, 350 th350/np205, d44 and 1.5" ORD tie rod, 14BFF w/discs , armored diff covers, 40" MTR's

10-03-2002, 03:20 PM	#4
Danny69' Registered User Join Date: May 2002 Location: Spokane, WA Posts: 93	383 is a 350 block, with a crank from a 400 and it's has the journals machined to a 350.. Forgot to add the obvious bore and strock. So you would need pistons, rods and whatnot. __________________ 1969' LWB [Work in Progress] Last edited by Danny69'; 10-03-2002 at 03:25 PM.

10-03-2002, 03:26 PM	#5
bigjimzlll Senior Member Join Date: Dec 2001 Location: Redding,CA...USA Posts: 4,736	302-327-350 same blocks..different cranks..you can buy a stroker crank new for 150.00, no need to ruin a good 400 crank __________________ It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications click the clicky to join the site.... http://67-72chevytrucks.com/vboard/payments.php 67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44 Anderson,CA

10-03-2002, 03:55 PM	#6
chevy garage Registered User Join Date: Aug 2002 Location: Maryville, TN Posts: 239	If you buy an aftermarket crank (SCAT) make sure you check your clearances with oil rails and oil pump. The throws on some of the aftermarkets are larger than the stock 400 cranks. I've seen a SCAT crank used and a spacer had to be made for the oil pump due to clearance reasons. Also, you probably want to balance the rotating assembly.



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